Calling device.



-.l. L. McQUARRlE.

m m. m V m a D1 Wifnesses:

027 $0 .hmes M Quark/1? JAMES L. MGQUARRIE, 0F MONTCLAIR, NEW JERSEY,ASSIGNOR T0 WESTERN ELECTRIC COMPANY, OZE NEW YORK, N. Y., A CORPORATIONOF ILLINOIS.

CALLING- DEVICE.

airs-ner.

Specification of Letters Patent.

Patented An 3, 19315.

Application fi1ed March 10, 1915. Serial No. 13,454.

-Montclair, in the county of Essex and State of New J ersey, haveinvented certain new and useful Improvements in Calling Devices, ofwhich the following is a full, clear,

concise, and exact description.

This invention relates to improvements in calling devices and moreparticularly to impulse senders for automatic and semi-automatictelephone systems. I

In impulse senders of the above type, the impulses are usually sent outduring the return movement of'the dial. The user sends out impulsescorresponding to digit numbers by inserting his finger in the properholds and pulling the dial around until a stationary stop is reached. Ithas been noticed that in cases when the two digit numbers are the same,the user is liable to leave his finger in the selected finger hold andforce the dial back to its normal position, thereby artificiallyincreasing the speed of rotation, of the impulse wheel. The result maybe that the impulses are not sent out in proper intervals for thecontrol of the automatic switches.

Many inventors have sought to provide means for preventing improperactuation of the dial during the sending out of impulses, by providingvarious kinds of locking means. The great drawback of such senders isthat their cost is high and that they easily get out of order.

The object of this invention is to provide a sender in which thepossibility of the subscribers interference withthe sending out ofimpulses is reduced to a minimum.

According to the main feature of this invention means are provided forallowing the users finger to slide out of engagement with theselectedfinger hold when the dial has been inoved to any of its operatingpositions.

The drawing represents a perspective view of a calling device'ofthefinger-hold dial type embodying this invention.

As calling devices of this class are wellknown in the art, and since, inconnection with the present invention, the construction of the interiormechanism of the device is immaterial, in the following detaildescription only those parts of the apparatus will be described to whichthe invention is directed.

A manually rotatable setting member or dial 2 is provided with aplurality of fingerholds 3 around its periphery. The spaces betweenfinger-holds 3 are open outwardly. In order to prevent the finger fromsliding out of engagement with a selected fingerhold 3, dial 2 issurrounded by a guiding member or frame 4:. The different digitcharacters are provided on a plate 5 mounted below dial 2. Plate 5 maybe either stationary or rotatable with dial 2. Instead of providing thedigit characters on a separate plate, they may be printed on the dial 2ad'-- jacent to the finger holds.

The user desiring to send out impulses representing any digit, insertshis finger in the hold corresponding to that digit and rotates dial 2until a stationary stop 6 provided on frame 4c is reached. During theforward rotation of dial 2, frame 4: prevents the users finger fromsliding out of the selected hold 3 in an outward direction. Adjacent tostop 6, however, a portion of frame 4 is cut away as shown, at 7, andwhen stop 6 is reached the users finger will slide out of the selectedhold through this opening7. In order to facilitate the sliding out ofthe operators finger the stop 6 is inclined toward the opening 7 fromthe direction of approach of the finger holds, as shown in the drawing.The dial is then free to return to normal without interference by theuser and the impulse sending mechanism will send out the desiredimpulses in the proper manner.

While the setting member of the calling device is referred to as a dial,it will be obvious to those skilled in the art that this invention isnot limited to the specified form of manually operable setting membershown, but is equally well applicable to setting members of Widelyvarying characters known in the art.

What is claimed is:

1. In a calling device, a manually operable membenhaving finger holds, astop toward which said finger holds move in the setting0P61at1011,..&11l guiding means cooperating with said finger holds andhaving and in the path of the finger holds, said stop surrounding saidfinger holds and having being inclined toward the opening from the anopening adjacent to said stop. 10

direction of approach of the finger-holds. In witness whereof, Ihereunto subscribe 3. In a calling device, a manually opermy name this9th day of March A. D., 1915.

5 able member rotatable in a forward and 'JAMES L. MGQUARRIE.

backward direction having finger holds, a Witnesses:

stop toward which said finger holds move in ANNA BOYLAN,

the setting operation, and guiding means E. EDLER.

Qopis of this patent may be obtained for five cents each, by addressingthe Commissioner of Iatents,

Washington, D. O,

